XR6 Six-Speed Manual
Wednesday, August 17, 2005
The Tremec T56 six speed manual transmission introduced at BA MK II on all XR6 Turbo and XR8 models will now be fitted to the XR6 sedan, from January 2006.
A new variant of the Tremec T56, with unique ratios specific to the XR6, will replace the existing T5 five speed unit.
XR6 T56 six speed manual -
1st gear ratio 3.36
2nd gear ratio 2.07
3rd gear ratio 1.35
4th gear ratio 1.00
5th gear ratio 0.80
6th gear ratio 0.62
Reverse 3.28
Final Drive 3.45
“The Tremec T56 for the XR6 sedan is the same transmission introduced at BA MK II on the XR6 Turbo and XR8 models, but with a new set of ratios, optimized using Computer Aided Engineering to suit the naturally aspirated Barra 190 engine,” Postgate said
“The dedicated ratios provide the optimum balance between performance and economy. The lower 1st gear improves launch feel and performance, while the additional top gear ratio reduces engine rpm at highway speeds, contributing to a reduction in fuel consumption.”
The T56 unit employed in the XR6 delivers improvements in shift quality courtesy of revisions introduced at BA MK II, as it has all the same features and advantages as the T56 transmission used on the XR6 Turbo, including:
Double synchros on all six forward gears
Linear bearings on the shift rail
Direct shifter linkage
Electronic reverse gear lockout (controlled by the
PCM)
Reverse gear synchro